Docs: remove irrelevant step from Prometheus Operator installation

[matskiv]

Description of your changes:
The # Wait for webhook CA secret to be created. steps doesn't make sense for Prometheus Operator, thus I'm proposing it's removal.

Which issue is resolved by this Pull Request:
N/A

[scylla-operator-bot]

Hi @matskiv. Thanks for your PR.

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[matskiv]

btw, contributing doc linked in the PR template and Readme doesn't exist anymore. I haven't found it, so couldn't send a PR to fix the link.
https://github.com/scylladb/scylla-operator/blob/master/.github/pull_request_template.md?plain=1#L1
https://github.com/scylladb/scylla-operator/blob/master/README.md?plain=1#L74

[tnozicka]

/ok-to-test

[tnozicka]

looks like a copy&paste leftover, thx

/approve
/lgtm

[scylla-operator-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: matskiv, tnozicka

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[tnozicka]

/lgtm cancel
please update the commit message (similar to the title)

[tnozicka]

btw, contributing doc linked in the PR template and Readme doesn't exist anymore. I haven't found it, so couldn't send a PR to fix the link.

yeah, that was too outdated so we rather removed it, but we shouldn't reference it

[matskiv]

please update the commit message (similar to the title)

I'm not sure I fully understood you. The commit message matches the title already.

[rzetelskik]

please update the commit message (similar to the title)

I'm not sure I fully understood you. The commit message matches the title already.

@matskiv thanks for the contribution!
This is about using imperative mood in the commit subject line and PR title.
https://cbea.ms/git-commit/#imperative

So changing it to something along the lines of Remove irrelevant step from Prometheus Operator installation guide should do.
This should have been mentioned in the contribution guide, if it hadn't been removed. 😉

[rzetelskik]

/kind documentation
/priority important-longterm